NOPR Collection:

Breeding biology of flat fish Pseudorhombus triocellatus (Bloch and Schn.) from Tuticorin waters, east coast of India

2016-12-07T06:09:53Z

Title: Breeding biology of flat fish Pseudorhombus triocellatus (Bloch and Schn.) from Tuticorin waters, east coast of India Authors: Ramanathan, N; Venkataramani, V K; Venkataramanujam, K Abstract: P. triocellatus breeds once a year for 2 to 3 months in Tuticorin waters. Eggs are released in a single batch. Spawning period extends from August to October. The size at first maturity is 71-80 mm total length. Females are more than males. Fecundity is related to total length and body weight. Page(s): 151-152

Seasonal variation in the natural growth of Asparagopsis delilei Montagne from the Mandapam region, east coast of India

2016-12-07T06:07:26Z

Title: Seasonal variation in the natural growth of Asparagopsis delilei Montagne from the Mandapam region, east coast of India Authors: Thomas, P C; Subbaramaiah, K Abstract: Asparagopsis delilei (= A.taxiformis) grows from August to May in the Mandapam region. The plants attain maximum growth during January-February, when seawater temperature and salinity values are low (27 ᵒ - 28 ᵒ C and 27 - 32 x 10 ^-3. Spermatangial plants occur earlier (maximum in January) than cystocarpic plants (maximum in May). Falkenbergia phase grows in all months except October and November, and produces tetraspores in March-April. In conclusion, seasonality in occurrence of the 2 phases of the alga, and correlation of its biomass with the environmental factors such as salinity and temperature of seawater are observed. Page(s): 148-150

Possible sources of aliphatic hydrocarbons in sediments of Hooghly estuary, northeast coast of India

2016-12-07T06:04:41Z

Title: Possible sources of aliphatic hydrocarbons in sediments of Hooghly estuary, northeast coast of India Authors: Ghosh, P B; Misra, S; Choudhury, A; Ghosh, A Abstract: Hydrocarbon content in sediments varied from 4.38 to 7.98 per cent of organic carbon. The chain lengths of hydrocarbons were from C₁₆ to C₃₈ carbon atoms with a strong predominance of even carbon number n-alkanes, especially in C₁₆–C₂₄ range. Instead of diagenetic reaction processes, the micro-organisms in the sedimentary environment probably play a vital role in the occurrence and distribution of such type of n-alkanes. Page(s): 145-147

Phosphorus availability and phosphatase activity in the sediments of Mandovi estuary, Goa

2016-12-07T06:02:10Z

Title: Phosphorus availability and phosphatase activity in the sediments of Mandovi estuary, Goa Authors: D’silva, C; Bhosle, N B Abstract: Alkaline phosphatase activity (APA) was measured as the rate of hydrolysis of p-nitrophenyl phosphate (p-NPP). Significant activity was observed in all sediment samples examined. Activity was inversely related to salinity, except in September where exceptionally high activity was observed at the mouth. Phosphatase was induced in response to phosphorus deficient conditions in the water column. Potential phosphatase activity was found to be indicative of the extent and rate of decomposition of organic phosphorus in sediments. In general, high phosphatase activity corresponded to low TP and low IP, but high OP in the sediments. Page(s): 143-144